With regulations affecting how fleets fit their wheels, the retreading industry is still deciding whether or not the inclusion of verified low-rolling-resistance tires on the EPA's SmartWay list has helped the industry.

The California Air Resources Board announced it settled 256 cases last year involving air quality violations by heavy-duty diesel truck and bus fleets that failed to comply with its various air quality programs with fines totaling nearly $2.2 million.

A tough critic of the California Air Resources Board and its policies over its regulation of diesel emissions, who was fired from his job at a California university, is finally getting his day in court this coming November.